Elementary Statistics: A Step By Step Approach
9th Edition
ISBN: 9780073534985
Author: Allan Bluman
Publisher: McGraw-Hill Science/Engineering/Math
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Question
Chapter 13, Problem 20CQ
(a)
To determine
To state: The hypotheses and identify the claim.
(b)
To determine
To find: The test value.
(c)
To determine
To find: The P-value.
(d)
To determine
To make: The decision.
(e)
To determine
To summarize: The results.
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Effectiveness of New Drug. To test the effectiveness of a new drug, a researcher gives one group of individuals the new drug and another group a placebo. The results of the study are shown here. At alpha=0.10, can the researcher conclude that the drug is effective? Use the P-value method. Medication Effective Not effective Drug 33 9 Placebo 13 18
Victims of Violence A random survey of 75 women who were victims of violence found that 22 were attacked by relatives. A random survey of 53 men found that 14 were attacked by relatives. At a=0.05, can it be shown that the percentage of women who were attacked by relatives is less than the percentage of men who were attacked by relatives? Use p1 for the proportion of women who were attacked by relatives. Use the P-value method with tables. Part 2. State the hypotheses and identify the claim with the correct hypothesis.
Part 3. Compute the test value. Always round score values to two decimal places.
Part 4. Find the -value. Round the answer to four decimal places.
Part 5. Reject or not to reject the null hypothesis.
measurements of people are built by giving them wood and asking them to build the tallest tower humanly possible. 1 of those expermiemnds was repeated a month later, with the times (in seconds) and five pairs of children’s completion times are listed below.
Test claim that there is a difference in times between two trials. (a) At α = 1%, use classical approach and conclude (b) Use the P-value approach to conclude it.
1st Trial (A) 35 28 29 26 29
2nd Trial (B)33 27 27 27 23 .
estimate of standard error =8
P-value method- Using the t-distribution, we find the p-value is equal to 0.3899 for two-tailed test. 0.3899> sign level a/2=0.005, we fail to reject. So there's notsufficient evidence to conclude a big difference on the times between the 2 trials
Chapter 13 Solutions
Elementary Statistics: A Step By Step Approach
Ch. 13.1 - The following table lists the percentages of...Ch. 13.1 - Exercises 131 1. What is meant by nonparametric...Ch. 13.1 - When should nonparametric statistics be used?Ch. 13.1 - Prob. 3ECh. 13.1 - List the disadvantages of nonparametric...Ch. 13.1 - Prob. 5ECh. 13.1 - Explain what is meant by the efficiency of a...Ch. 13.1 - Prob. 7ECh. 13.1 - Prob. 8ECh. 13.1 - Prob. 9E
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